Five concrete examples of the Color Contrast Checker in real use. Each one shows the situation, what you put in and what comes out, so you can copy the structure, swap in your details and adapt it this week.
Example 1: Verifying body text meets WCAG AA
The task: Verifying body text meets WCAG AA. You start from a foreground colour and a background colour.. The tool returns the numeric contrast ratio plus pass or fail results for each WCAG text size and level., giving you a clear verdict on whether real users can read the text you are about to ship. you can edit rather than a blank page.
Make it yours: add one detail the tool cannot know - a real number, a name, a constraint - then read the result once end to end before you keep it.
Example 2: Checking a button colour against its label
The task: Checking a button colour against its label. You start from a foreground colour and a background colour.. The tool returns the numeric contrast ratio plus pass or fail results for each WCAG text size and level., giving you a clear verdict on whether real users can read the text you are about to ship. you can edit rather than a blank page.
Make it yours: add one detail the tool cannot know - a real number, a name, a constraint - then read the result once end to end before you keep it.
Example 3: Validating a theme against light and dark modes
The task: Validating a theme against light and dark modes. You start from a foreground colour and a background colour.. The tool returns the numeric contrast ratio plus pass or fail results for each WCAG text size and level., giving you a clear verdict on whether real users can read the text you are about to ship. you can edit rather than a blank page.
Make it yours: add one detail the tool cannot know - a real number, a name, a constraint - then read the result once end to end before you keep it.
Example 4: Auditing an existing design system
The task: Auditing an existing design system. You start from a foreground colour and a background colour.. The tool returns the numeric contrast ratio plus pass or fail results for each WCAG text size and level., giving you a clear verdict on whether real users can read the text you are about to ship. you can edit rather than a blank page.
Make it yours: add one detail the tool cannot know - a real number, a name, a constraint - then read the result once end to end before you keep it.
Example 5: Documenting accessibility decisions for review
The task: Documenting accessibility decisions for review. You start from a foreground colour and a background colour.. The tool returns the numeric contrast ratio plus pass or fail results for each WCAG text size and level., giving you a clear verdict on whether real users can read the text you are about to ship. you can edit rather than a blank page.
Make it yours: add one detail the tool cannot know - a real number, a name, a constraint - then read the result once end to end before you keep it.
A Full Worked Example
Input: text #334155 · background #f8fafc
Ratio 9.4:1 — passes AA and AAA for normal text, AA and AAA for large text.
The pattern behind every example above: context and constraints go in, structure comes out, and your edit makes it true.
How to Build Your Own Examples
- Take a task already on your calendar for this week.
- Write the brief in two sentences: the job and the audience.
- Generate, compare against the version you would have written manually.
- Save the prompt alongside the result so the second run takes seconds.
Getting More From Each Example
Most people stop at the first result. Generate a second version with one changed variable - length, tone or angle - and compare. The better version usually appears on the second run, not the first.
Frequently Asked Questions
What contrast ratio do I need?
WCAG AA requires 4.5:1 for normal text and 3:1 for large text; AAA raises normal text to 7:1.
What counts as large text?
Roughly 18pt regular or 14pt bold - the tool applies the official thresholds for you.
Does passing guarantee accessibility?
No - contrast is one requirement among many, but failing it is a definite barrier.
Are my colours uploaded?
No - all calculations run in your browser.
Related Guides
- How to Use Color Contrast Checker
- What Is a Color Contrast Checker and How Does It Work?
- Color Contrast Checker Not Working? How to Fix It
- Color Contrast Checker for Designers and Front-end Developers
- Best Color Contrast Checker Alternatives Worth Trying
- Color Contrast Checker Tips and Best Practices
- Is Color Contrast Checker Safe? Free vs Paid
- More color tools and guides